Yes, it has no licensing fees, and its being used in pinepen, some small electronics like calculators, and do you mean dev kits like this? They are arduino like devices with low power edge AI/neural capabilities. https://www.seeedstudio.com/sipeed

On linux, they are making one with an allwinner chip called the D1. https://www.hackster.io/news/sipeed-teases-linux-capable-64-...

RISC-V is not inherently better or more secure, its a different instruction set with no fees, so anyone can make one, its possible to be less secure.